国电联合动力技术有限公司】前程无忧官方招聘

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1、Theseloadscancausedamageorweakeningofthestructureespeciallyforagingmilitaryandcivilianaircrafttherebyaffectingitsloadcarryingcapabilities.Hence,arepairorreinforcementofthedamagedorweakenedpartofthestructuretorestorethestructuralefficiencyandthusassurethecontinuedairwor

2、thinessoftheaircrafthasbecomeanimportantissueinrecentyearstomilitaryandcivilianaircraftoperators.TheUSAirForceinrecentyearshasshownconsiderableinterestintheuseofadvancedcompositestorepaircrackedmetallicaircraftstructurestoenhancetheirlife.Oneissuepreventingusingbondedc

3、ompositepatches,asastandardmeansofrepairingdamagedmetallicaircraftstructuresisthefactthattheintegrityoftherepairsisunknown.Inthispaperthedesign,analysisanddurabilityofadhesivelybondedcompositepatchrepairsofcrackedaircraftaluminumpanelsisreported.Pre-cracked2024-T3clada

4、luminumpanelsof381×89×1.6mm(15×3.5×0.063in.)repairedwithoctagonalsinglesidedboron/epoxycompositepatchwereusedastestspecimen.Twodifferentcompositeplyconfigurations,5-and6-plywereinvestigated.Linearandnon-linearfiniteelementanalyseswereperformedonthetestspecimenusing8-no

5、ded24degreeoffreedom(DOF)hexagonalelementsforthealuminumpanel,boron/epoxypatchandadhesivematerialsubjectedtouni-axialtensileloading.Thestressdistributionsobtainedwereusedtopredicttheincreaseinstrengthanddurabilityoftherepairedstructure.Acomparisonofthestressvaluesatcri

6、ticalpointswasmade.Theanalysisalsowasusedtovalidatevariousassumptionsmadeinthedesignofthecompositepatch.Experimentalinvestigationswereconductedonthecrackedaluminumpanelrepairedwitha5-plycompositepatchaswellasontwobaseline-unpatchedpanels(onewithacrackandonewithnocrack)

7、byuni-axialtensiletestingtovalidatetheanalyticalresults.TheexperimentwasconductedontheInstrontension-testingmachine.Itwasfoundthatthemaximumskinstressdecreasessignificantlyaftertheapplicationofthepatchandtheregionofmaximumskinstressshiftsfromthecrackfrontforanunpatched

8、paneltothepatchedgesforapatchedone.ArticleOutline1.Introduction2.Problemdefinition3.Designofpatch3.1.Overlaplength3.2